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I have to ask where is ultra fast boot but I do have fast boot enabled
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Disabling CSM caused a non boot for me but I have a feeling it is to do with the OS on SSD.
I had an F1 option to enable CSM in bios with an incompatibility hardware warning upon boot attempt.
All setting same in bios apart from OS SSD was now last in boot priority.

I have to ask what is the objective in this?
 

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Quote:
Originally Posted by blaze0079 View Post

There isn't an option to enable ultra fast boot but disabling CSM will enable full efi mode which is the same as ultra fast boot.

What I'm trying to find out from this is if there is a bug in asus bios what cause the system to not boot if you have multiple gpu in your system and disable CSM. also did you install windows using GPT or MBR Format.

I have no problem disabling CSM on an asrock extreme 4 gen 3 and a gigabyte z77x-ud3h.
Ok I not familiar with this but would I have to disable CSM before installing Windows 8.1 if that's the case I didn't
I am pretty sure I installed as MBR
 
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